/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.coyote.http11;

import org.apache.coyote.OutputBuffer;
import org.apache.coyote.Response;
import org.apache.tomcat.util.buf.ByteChunk;

import java.io.IOException;

/**
 * Output filter.
 *
 * @author Remy Maucherat
 */
public interface OutputFilter extends OutputBuffer {

	/**
	 * Write some bytes.
	 *
	 * @return number of bytes written by the filter
	 */
	@Override
	public int doWrite(ByteChunk chunk, Response unused)
			throws IOException;

	/**
	 * Some filters need additional parameters from the response. All the
	 * necessary reading can occur in that method, as this method is called
	 * after the response header processing is complete.
	 */
	public void setResponse(Response response);

	/**
	 * Make the filter ready to process the next request.
	 */
	public void recycle();

	/**
	 * Set the next buffer in the filter pipeline.
	 */
	public void setBuffer(OutputBuffer buffer);

	/**
	 * End the current request. It is acceptable to write extra bytes using
	 * buffer.doWrite during the execution of this method.
	 *
	 * @return Should return 0 unless the filter does some content length
	 * delimitation, in which case the number is the amount of extra bytes or
	 * missing bytes, which would indicate an error.
	 * Note: It is recommended that extra bytes be swallowed by the filter.
	 */
	public long end()
			throws IOException;


}
